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I'm working on a chemistry question where I'm supposed to use average bond energies to estimate enthalpy changes for a reaction. It gives me these bond energies to work with:

$$\begin{align} \ce{C-H}&=&413\\ \ce{C-C}&=&348\\ \ce{C-Br}&=&276\\ \ce{H-Br}&=&366\\ \ce{CkC}&=&614\\ \end{align}$$ I know how to do the question, but I don't what $\ce{CkC}$ is. I can't find it online or in my textbook. What does the "k" mean?

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  • $\begingroup$ Which text book did you find this notation in? The info will help future visitors having similar problem. $\endgroup$ Mar 24, 2018 at 13:08

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$\ce{C=C}$ average bond energy is somewhere around $\pu{614 kJ/mol}$ so "k" probably indicates a double bond

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